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Welding polarity effects on weld spatters and bead geometry of hyperbaric dry GMAW
Chinese Journal of Mechanical Engineering volume 29, pages 351–356 (2016)
Abstract
Welding polarity has influence on welding stability to some extent, but the specific relationship between welding polarity and weld quality has not been found, especially under the hyperbaric environment. Based on a hyperbaric dry welding experiment system, gas metal arc welding(GMAW) experiments with direct current electrode positive(DCEP) and direct current electrode negative(DCEN) operations are carried out under the ambient pressures of 0.1 MPa, 0.4 MPa, 0.7 MPa and 1.0 MPa to find the influence rule of different welding polarities on welding spatters and weld bead geometry. The effects of welding polarities on the weld bead geometry such as the reinforcement, the weld width and the penetration are discussed. The experimental results show that the welding spatters gradually grow in quantity and size for GMAW with DCEP, while GMAW with DCEN can produce fewer spatters comparatively with the increase of the ambient pressure. Compared with DCEP, the welding current and arc voltage waveforms for DCEN is more stable and the distribution of welding current probability density for DCEN is more concentrated under the hyperbaric environment. When the ambient pressure is increased from 0.1 MPa to 1.0 MPa, the effects of welding polarities on the reinforcement, the weld width and the penetration are as follows: an increase of 0.8 mm for the weld reinforcement is produced by GMAW with DCEN and 1.3 mm by GMAW with DCEP, a decrease of 7.2 mm for the weld width is produced by DCEN and 6.1 mm by DCEP; and an increase of 3.9 mm for the penetration is produced by DCEN and 1.9 mm by DCEP. The proposed research indicates that the desirable stability in the welding procedure can be achieved by GMAW with DCEN operation under the hyperbaric environment.
References
LIANG Ming, WANG Guorong, ZHONG Jiguang. Vision-based seam tracking system of the underwater flux-cored arc welding[J]. Chinese Journal of Mechanical Engineering, 2007, 43(3): 148–153. (in Chinese)
TANG Deyu, NIU Huli, XUE Long. Study on underwater hyperbaric dry GMAW[J]. Electric Welding Machine, 2012, 42(12): 1–5. (in Chinese)
GERHARDT A, JUNG W. Power source for hyperbaric underwater arc welding[J]. Metel Construction, 1985, 17(7): 440–442.
OZDEN H, GURSEL K T. Service life of tungsten electrodes in hyperbaric dry underwater welding[J]. Welding Journal, 2005, 84(6): 94–99.
LIU Jian, XUE Long, HUANG Jiqiang, et al. Prediction of hyperbaric GMAW appearance based on BP neural networks[J]. Journal of Shanghai Jiaotong University, 2014, 48(Sup. I): 53–55. (in Chinese)
JIAO Xiangdong, YANG Yongyong, ZHOU Canfeng. Seam tracking technology for hyperbaric underwater welding[J]. Chinese Journal of Mechanical Engineering, 2009, 22(2): 265–269. (in Chinese)
RICHARDSON L M, NIXON J H. Deepwater hyperbaric welding— initial process evaluation[J]. Proceedings of the International Offshore and Polar Engineering Conference, 1997(4): 493–501.
LI Kai, GAO Hongming, LI Haichao. Arc behavior of dry hyperbaric gas metal arc welding[J]. Advanced Materials Research, 2014, 988: 245–248. (in Chinese)
JIA Binyang. The impact of hyperbaric gas ambient to GMAW welding arc shape[D]. Beijing: Beijing University of Chemical Technology, 2012. (in Chinese)
HUANG Jiqiang, XUE Long, LÜ Tao. Arc characteristics of GMAW welding in high-pressure air condition[J]. China Welding, 2012, 31(12): 26–31.
ZHAO Huaxia. Research on characteristics of hyperbaric welding arc and behavior of droplet transfer[D]. Beijing: Beijing University of Chemical Technology, 2010. (in Chinese)
AZAR A S, WOODWARD N, FOSTERVOLL H, et al. Statistical analysis of the arc behavior in dry hyperbaric GMA welding from 1 to 250 bar[J]. Journal of Materials Processing Technology, 2012, 212(1): 211–219.
WU Jinming, XUE Long, HUANG Jiqiang, et al. Influence of environmental pressure on GMAW process and the weld bead appearance[J]. Journal of Shanghai Jiaotong University, 2015, 49(3): 315–318. (in Chinese)
MIHOLCA C, NICOLAU V. Pressure influence upon the welded metal geometry on the M. A. G. hyperbaric procedure by estimating the spectral power of the electrical ARC signals[J]. Welding in the World, 2005, 49(9): 276–277.
AZAR A S, ÅS S K, AKSELSEN O M. Analytical modeling of weld bead shape in dry hyperbaric GMAW using Ar-He chamber gas mixtures[J]. Journal of Materials Engineering and Performance, 2013, 22(3): 673–680.
WANG Zhonghui JIANG Lipei JIAO Xiaodong. Impact of atmosphere pressure on all-position weld shaping of hyperbaric welding[J]. Chinese Journal of Mechanical Engineering, 2007, 46(8): 21–25. (in Chinese)
POHL R, WERNICKE R. Investigations into the fatigue strength of repair welds manufactured by means of hyperbaric welding[J]. Welding and Cutting, 2000, 52(3): 47–51.
AKSELSEN O M, FOSTERVOLL H, AHLEN C H. Hyperbaric GMA welding of duplex stainless steel at 12 and 35 bar[J]. Welding Journal, 2009, 88(2): 21–28.
LI Qingming, WEI Xu, DU Baoshuai, et al. Investigation on the correlation between the selection of polar and heat generation of the anode and cathode during arc welding[J]. Electric Welding Machine, 2011, 41(6): 29–31. (in Chinese)
PRAVEEN P, KANG M J, YARLAGADDA P K D V. Arc voltage behavior in GMAW-P under different drop transfer modes[J]. Journal of Achievements in Materials and Manufacturing Engineering, 2009, 32(2): 196–202.
FU Qiang, XUE Songbai, YAO Heqing. Research and development of variable polarity gas metal arc welding[J]. Electric Welding Machine, 2010, 40(10): 26–29. (in Chinese)
YANG Yunqiang, SONG Yonglun, LI Junyue, et al. Research on spectrum sensing and control metal transfers[J]. Chinese Journal of Mechanical Engineering, 2004, 40(2): 145–149. (in Chinese)
CHEN Maoai, JIANG Yuanning, WU Chuansong. Effect of welding current waveforms on metal transfer and weld geometry in controlled short circuiting transfer GMAW[J]. Journal of Mechanical Engineering, 2014, 50(4): 86–91. (in Chinese)
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Supported by National Natural Science Foundation of China(Grant No. 51275051), and Innovation and Improvement Plan of Beijing Education Commission, China(Grant No.TJSHG201510017023)
Biographical notes
XUE Long, born in 1966, is currently a professor at Beijing Institute of Petrolchemical Technology, China. He received his PhD degree from China University of Petroleum, China, in 2014. His research interests include underwater welding, man-machine system, robotics and ocean engineering.
WU Jinming, born in 1990, is currently a master candidate at Opto-Mechatronic Equipment Technology Beijing Area Major Laboratory, Beijing Institute of Petrolchemical Technology, China.
HUANG Junfen, born in 1975, a lecturer at Beijing Institute of Petrolchemical Technology, China. She received her PhD degree from Beijing University of Technology, China, in 2005. Her research interests include underwater welding, robotics and ocean engineering.
HUANG Jiqiang, born in 1971, an associate professor at Beijing Institute of Petrolchemical Technology, China. He received his PhD degree from Beijing University of Technology, China, in 2004. His research interests include underwater welding, welding automation.
ZOU Yong, born in 1976, is currently a lab master at Beijing Institute of Petrochemical Technology, China. He received his master degree on mechatronics at China University of Petroleum, China, in 2004.
LIU Jian, born in 1988, is currently a master candidate at Opto-Mechatronic Equipment Technology Beijing Area Major Laboratory, Beijing Institute of Petrolchemical Technology, China.
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Xue, L., Wu, J., Huang, J. et al. Welding polarity effects on weld spatters and bead geometry of hyperbaric dry GMAW. Chin. J. Mech. Eng. 29, 351–356 (2016). https://doi.org/10.3901/CJME.2015.1104.131
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DOI: https://doi.org/10.3901/CJME.2015.1104.131